APA (7th ed.) Citation

Keller, R. (1994). On language change: The invisible hand in language. Routledge.

Chicago Style (17th ed.) Citation

Keller, Rudi. On Language Change: The Invisible Hand in Language. London: Routledge, 1994.

MLA (9th ed.) Citation

Keller, Rudi. On Language Change: The Invisible Hand in Language. Routledge, 1994.

Warning: These citations may not always be 100% accurate.